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+--- Thread: Todays Project - What did you do today? (/thread-727.html)
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RE: Todays Project - What did you do today? - Pete O - 10-22-2016
Greg- those variable diameter pulleys have always seemed to me like a brilliant thing. A question- does the whole mechanism float freely on the shaft so that it self-aligns as the gap varies? Also, does this one use a normal belt? I saw one the drive of a skid-steer loader a few years ago and it had a belt that was about 2" wide, only ever seen one other and it was not mounted in a machine so never saw the belt.
RE: Todays Project - What did you do today? - f350ca - 10-22-2016
The pulley is fixed to the shaft, usually the designers don't worry about the alignment. My Rockwell wood lathe, Hardinge lathe and the Logan shaper I had used two belts with the pulley in the middle having a floating centre. That system gives a huge ratio range, but the belts ran on a slight angle as the position of the centre pulley changes.
On this OLD Delta saw, (found a brochure form 1944) on it they have the motor mount slide in an angled mount to compensate for the change in angle. Oh yah this uses a standard with belt as did the Rockwell and Logan, the Hardinge uses a v-belt about an inch wide.
RE: Todays Project - What did you do today? - EdK - 10-22-2016
Worked on a work stop for my Kurt vise. Just got the shaft turned. It took a while to turn because of the interrupted cut. I didn't want to push it too hard and chip the carbide tool.
Ed
[attachment=13814] [attachment=13815]
RE: Todays Project - What did you do today? - Roadracer_Al - 10-23-2016
I usually switch over to HSS tools to rough out jobs like that, then switch back over to carbide to do the finishing passes.
I use a roughing tool grind that I saw on Adam Booth's channel, but can't seem to find it.
It's flat on top (i.e. no top relief), has some front relief and side relief (actually, not much, only about 5° to create a strong cutting edge) and a small 45° chamfer with relief on the leading corner of the tool to keep the edge from breaking down. He also cuts a chip breaker into the top using the corner of the wheel. The chip breaker doesn't come to the edge - it's about 1/16" back from the edge. I believe it works to chill the underside of the chip, making it break.
It's a beast of a tool - I've cut .25" DOC (1/2" diameter reduction) on mild steel with it. It requires not only a short grip on the work, but also a shoulder bearing against the chuck jaws or it will just extrude the work through the jaws. It also requires lots of lube, some HP, and low RPM for a big cut like that.
RE: Todays Project - What did you do today? - EdK - 10-24-2016
(10-23-2016, 04:13 PM)Roadracer_Al Wrote: I usually switch over to HSS tools to rough out jobs like that, then switch back over to carbide to do the finishing passes.
That's normally what I do also but I couldn't find my HSS tool bit so I just used what I could find.
Ed
RE: Todays Project - What did you do today? - Old Minger - 10-24-2016
I finally put together this little vice that i found on CL for $20 and yes It's not a coincidence that this is the same colour as my Bridgeport mill restoration project. While the paint was flying everything got a coat of grey.
Still have to make some soft jaws for it, if only I had a milling machine!
[attachment=13825]
RE: Todays Project - What did you do today? - EdK - 10-24-2016
(10-24-2016, 04:57 PM)Old Minger Wrote: Still have to make some soft jaws for it, if only I had a milling machine!
If you send me the dimensions, I'd be happy to make the soft-jaws for you.
Ed
RE: Todays Project - What did you do today? - Old Minger - 10-24-2016
Thanks Ed, that's really kind of you.
I'll go and have a measure up and send you the dimensions.
If you could make them out of something soft like ... 18ct gold that would be awesome
Cheers
John
RE: Todays Project - What did you do today? - Vinny - 10-24-2016
I think he only stocks 24ct gold.
RE: Todays Project - What did you do today? - Old Minger - 10-24-2016
(10-24-2016, 05:12 PM)EdK Wrote:(10-24-2016, 04:57 PM)Old Minger Wrote: Still have to make some soft jaws for it, if only I had a milling machine!
If you send me the dimensions, I'd be happy to make the soft-jaws for you.
Ed
PM sent.